Brush-holder



1. s. DEAN. BRUSH HOLDER.

APPLiCATlON FILED NOV. 16, I917.

Patented Dec. 28, 1920.

INVENTOR John 5. Dean.

WITNESSES: (01m 5. 511/.

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' ATTORNEY UNITED STATES PATENT OFFICE.

JOHN S. DEAN, OF EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

BRUSH-HOLDER.

Application filed November 16, 1917.

T 0 all whom it may concern:

Be it known that I, JOHN S. DEAN, a citizen of the United States, and a resident of Edgewood Park, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Brush- I-Iolders, of which the following is a specification.

invention relates to brush-holders for dynamo-electric machines and it has particular relation to means for producing pressure upon the brushes of such machines.

The object of'my invention is to provide a simple and inexpensive device of the character indicated that shall allow unservice able parts to be replaced without discarding parts still in good condition and which shall prolong the life of the flexible conductor that is attached to the contact piece.

Heretofore, it has been customary, in brush-holder construction, to braze the spring, the flexible connection and the contact piece together. An objection to this method of connection is that, when any one of the parts needs to be replaced, the other parts, even though in perfect condition, must bethrown away.

Referring to the drawings, Figure 1 is a cross-sectional view of a brush-holder embodying a device constructed in accordance with my invention, and Figs. 2 and 3 are elevational views of slight modifications of the device shown in Fig. 1.

The brush-holder usually comprises a main body member 1 provided with a brush 2 that is mounted in a brush'box 3 and is adapted to engage a coacting rotatable surface 1 of the dynamo-electric machine (not shown). The brush 2 is held in close engagement with the surface 4 by means of a spring 5, or other suitable pressure-producing means. Electrical contact is made from the brush 2, through a contact member 7 and a flexible connection 6 brazed thereto, to the brush-holder body 1.

The contact member 7 is brazed to the flexible connection 6 and is slidably mounted on a straight end portion 8 of the spring 5. The contact member 7 has end portions 9 and 10 so bent toward the brush 3 as to engage its sides,.when it is displaced, and thereby prevent the contact piece from becoming disengaged from the brush and slid ing from the end of the spring. On the opposite side of the contact member 7 is a Specification of Letters Patent.

Patented Dec. 28, 1920.

Serial No. 202,320.

projection 11 that is flared away from the flexible connection 6, at their point of en gagement, in order to preclude cutting the lexibleconnection when forced against it.

In Fig. 2 I have shown a slight modification of my invention, in which the spring 5 and a contact member 12 are connected together by means of a rivet 13, the contact member and flexible connection being brazed together. In order to renew either of the parts, the rivet is removed, the part replaced and a new rivet inserted. The rivet is placed at the end of the spring in order not to weaken it.

Fig. 3 shows a slight modification of what is shown in Fig. 2, the relative positions of the flexible connection 6 and the spring 5 being reversed, and the flexible connection, the spring and the contact member being all connected together by means of a rivet.

From the foregoing description, it will be readily apparent to those skilled in the art that parts may be easily renewed in a short space of time without discarding other serviceable parts, and that the flexible conductor 6 cannot be cut by the contact member 7 thereby prolonging its period of service.

While I have herein shown several forms of my invention and described in detail one application of the same, I do not wish to be understood as limiting myself to the structural features herein disclosed, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or are specifically set forth in the appended claims.

I claim as my invention:

'1. A brush-holder device comprising a body member and a brush box provided with a brush and combined contact-making and pressure-producing means consisting of a pressure-producing means and a contact member loosely mounted thereon and normally in abutting frictional engagement with said brush on one side and said pres sure producing means on the other side.

2. A brush-holder device comprising a body member and a brush box provided with a brush and combined contact-making and pressure-producing means consisting of a spring. a contact member loosely mounted on said spring to engage said brush, and a body member and a brush box provided with a brush and combined contact-making and pressure-producing means consisting of a spring, a contact member slidably mounted on said spring to engage said brush, and a flexible conductor permanently connected to said contact member.

4. A brush-holder device comprising a body member and a brush box provided with a brush and combined contact-making and pressure-producing means consisting of a. spring, a contact member slidably mounted on said spring and normally in abutting frictional engagement with said brush and having means to prevent it from sliding from the end of said spring.

5. A brush-holder device comprising a body member and a brush box provided with. a brush and combined contact-making and pressure-producing means consisting oi? a spring and a contact member slidably mounted on said spring to engage said brush and having means to prevent it from sliding out of engagement therewith.

6. A brush-holder device comprising a body member and a brush box provided with a brush and combined contact-making and pressure-producing means consisting of a spring and a contact member slidably mounted on said spring to engage said brush and having its end portions so bent and spaced therefrom as to engage said brush laterally only when said contact member begins to move out of position.

7. A brush-holder device comprising a body member and a brush box provided with a brush and combined contact-making and pressure-producing means consisting o! a spring, a flexible conductor, a contact 1ne1nber permanently attached to said conductor and slidably mounted on said spring to engage said brush and having its end portions on one side so bent as to prevent it sliding on said brush and said spring and the end portion on the opposite side being flared away from the flexible conductor at its point of engagement therewith.

In testimony whereof, I have hereunto subscribed my name this 19th day of (let. 1917.

JOHN S. DEAN. 

